Department of Mechanical Engineering, Universidade Federal de Santa Catarina, Campus Universitário, CxP 476 Trindade, Florianópolis, SC 88040-900, Brazil.
Carbohydr Polym. 2013 Apr 15;94(1):655-62. doi: 10.1016/j.carbpol.2013.01.041. Epub 2013 Feb 4.
An electrically conducting composite based on bacterial cellulose (BC) and polypyrrole (PPy) was prepared through in situ oxidative polymerization of pyrrole (Py) in the presence of BC membrane using ammonium persulfate (APS), as an oxidant. The electrical conductivity, morphology, mechanical properties and thermal stability of the composites obtained using APS (BC/PPy·APS) were evaluated and compared with BC/PPy composites prepared using as oxidant agent Iron III chloride hexahydrate (FeCl3·6H2O). The morphology of the BC/PPy·APS composites is characterized by spherical conducting nanoparticles uniformly distributed on the BC nanofiber surface, while the composites produced with FeCl3·6H2O (BC/PPy·FeCl3) is composed of a continuous conducting polymer layer coating the BC-nanofibers. The electrical conductivity of BC/PPy·FeCl3 was 100-fold higher than that found for BC/PPy·APS composites. In order to understand the site-specific interaction between PPy and BC functional groups, both composites were characterized by Fourier transform infrared (attenuated total reflectance mode) spectroscopy attenuation reflectance (FTIR-ATR) and X-ray photoelectron spectrometry (XPS). The affinity between functional groups of PPy·FeCl3 and BC is higher than that found for BC/PPy·APS composite. In addition, the tensile properties were also influenced by the chemical affinity of both components in the polymer composites.
一种基于细菌纤维素（BC）和聚吡咯（PPy）的导电复合材料是通过在 BC 膜存在下，使用过硫酸铵（APS）作为氧化剂，将吡咯（Py）原位氧化聚合制备的。使用过硫酸铵（BC/PPy·APS）制备的复合材料的电导率、形貌、力学性能和热稳定性进行了评价，并与使用六水合三氯化铁（FeCl3·6H2O）作为氧化剂制备的 BC/PPy 复合材料进行了比较。BC/PPy·APS 复合材料的形态特征是球形导电纳米颗粒均匀分布在 BC 纳米纤维表面，而使用 FeCl3·6H2O（BC/PPy·FeCl3）制备的复合材料则由连续的导电聚合物层包覆 BC-纳米纤维组成。BC/PPy·FeCl3 的电导率比 BC/PPy·APS 复合材料高 100 倍。为了了解 PPy 和 BC 官能团之间的特定位置相互作用，对两种复合材料进行了傅里叶变换红外（衰减全反射模式）光谱衰减反射（FTIR-ATR）和 X 射线光电子能谱（XPS）表征。PPy·FeCl3 中官能团与 BC 之间的亲和力高于 BC/PPy·APS 复合材料。此外，聚合物复合材料中两种组分的化学亲和力也影响了拉伸性能。
